<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>

</html>
<script>
    var x = prompt('输入一个数字x');
    var y = prompt('输入一个数字y');
    var z 
    z = x;
    x = y;
    y = z; 
    if (x > y) {
        min = y;
        max = x;
        console.log(x)
    } else {
        min = x;
        max = y;
        console.log(y)
    }
    alert("交换后x=" + x +",y="+y+"，输出最大值显示在控制器里");
   

</script>